<template>
  <div>

    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>
      <!-- 表格 -->
      <tree-table
        class="treeTable"
        :data="cateList"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        index-text="#"
        :show-row-hover="false"
        show-index
        border
      >
        <!-- 是否有效 -->
        <template slot="isOk" slot-scope="scope">
          <i
            class="el-icon-success"
            style="color: lightgreen"
            v-if="scope.row.cat_deleted === false"
          ></i>
        </template>
        <!-- 排序 -->
        <template slot="order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag size="mini" type="success" v-else-if="scope.row.cat_level === 1">二级</el-tag>
          <el-tag size="mini" type="warning" v-else>三级</el-tag>
        </template>
        <!-- 操作 -->
        <template slot="opt" slot-scope="scope">
          <el-button
            type="primary"
            icon="el-icon-edit"
            size="mini"
            @click="showEditCateDialog(scope.row.cat_id)"
          >编辑</el-button>
          <el-button
            type="danger"
            icon="el-icon-delete"
            size="mini"
            @click="removeCate(scope.row.cat_id)"
          >删除</el-button>
        </template>
      </tree-table>
      <!-- 分页 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum"
        :page-sizes="[3, 5, 10, 15]"
        :page-size="queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      ></el-pagination>
    </el-card>
    <!-- 添加分类的对话框 -->
    <el-dialog
      title="添加分类"
      :visible.sync="addCateDialogVisible"
      width="50%"
      @close="addCateDialogClosed"
    >
      <el-form
        :model="addCateForm"
        :rules="addCateFormRules"
        ref="addCateFormRef"
        label-width="100px"
      >
        <el-form-item label="分类名称：" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类：">
          <!-- options：数据源 -->
          <!-- props：指定配置对象 -->
          <el-cascader
            v-model="selectedKeys"
            :options="parentCateList"
            :props="cascaderProps"
            @change="parentCateChanged"
            clearable
            filterable
            style="width: 100%"
          ></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 编辑分类的对话框 -->
    <el-dialog title="编辑分类" :visible.sync="editCateDialogVisible" width="50%">
      <el-form
        :model="editCateForm"
        :rules="editCateFormRules"
        ref="editCateFormRef"
        label-width="100px"
      >
        <el-form-item label="分类名称：" prop="cat_name">
          <el-input v-model="editCateForm.cat_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="eidtCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类数据
      cateList: [],
      // 查询条件
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      total: 0,
      // 为table指定列的定义
      columns: [
        {
          label: "分类名称",
          prop: "cat_name"
        },
        {
          label: "是否有效",
          // 当前列 自定义模板
          type: "template",
          template: "isOk"
        },
        {
          label: "排序",
          // 当前列 自定义模板
          type: "template",
          template: "order"
        },
        {
          label: "操作",
          // 当前列 自定义模板
          type: "template",
          template: "opt"
        }
      ],
      // 添加分类
      addCateDialogVisible: false,
      // 添加分类对象
      addCateForm: {
        // 将要添加分类名称
        cat_name: "",
        // 分类父级id
        cat_pid: 0,
        // 分类等级：`0`表示一级分类；`1`表示二级分类；`2`表示三级分类
        cat_level: 0
      },
      // 添加分类表单的验证规则
      addCateFormRules: {
        cat_name: [
          { required: true, message: "请输入分类名称", trigger: "blur" }
        ]
      },
      // 父级分类列表
      parentCateList: [],
      // 指定级联选择器的配置对象
      cascaderProps: {
        // 配置触发选项 hover/click
        expandTrigger: "hover",
        value: "cat_id",
        label: "cat_name",
        children: "children"
      },
      // 选中的父级Id数组
      selectedKeys: [],
      // 编辑对话框 控制
      editCateDialogVisible: false,
      // 编辑分类表单验证
      editCateFormRules: {
        cat_name: [
          { required: true, message: "请输入分类名称", trigger: "blur" }
        ]
      },
      // 编辑表单 绑定对象
      editCateForm: ""
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
   
    async getCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: this.queryInfo
      });
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类失败！");
      }
      // 给数据列表赋值
      this.cateList = res.data.result;
      // 总数据条数
      this.total = res.data.total;
    },
    // 监听 pageSizeChange
    handleSizeChange(newSize) {
      this.queryInfo.pagesize = newSize;
      this.getCateList();
    },
    // 监听 pagenum改变
    handleCurrentChange(newPage) {
      this.queryInfo.pagenum = newPage;
      this.getCateList();
    },
    
    showAddCateDialog() {
      // 先获取父级分类数据
      this.getParentCateList();
      // 再打开对话框
      this.addCateDialogVisible = true;
    },
    // 获取父级分类的数据
    async getParentCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: { type: 2 }
      });
      if (res.meta.status !== 200) {
        return this.$message.error("获取父级分类失败！");
      }
      this.parentCateList = res.data;
    },
    // 添加分类 选择项发生变化触发
    parentCateChanged() {
      // 如何selectKeys 数组的长度>0 说明选中父级分类
      if (this.selectedKeys.length > 0) {
        // 父级分类的Id
        this.addCateForm.cat_pid = this.selectedKeys[
          this.selectedKeys.length - 1
        ];
        // 当前分类的等级
        this.addCateForm.cat_level = this.selectedKeys.length;
        return 0;
      } else {
        // 父级分类的Id
        this.addCateForm.cat_pid = 0;
        // 当前分类的等级
        this.addCateForm.cat_level = 0;
      }
    },
    // 添加分类
    addCate() {
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) return;
        const { data: res } = await this.$http.post(
          "categories",
          this.addCateForm
        );
        if (res.meta.status !== 201) {
          return this.$message.error("添加分类失败！");
        }

        this.$message.success("添加分类成功！");
        this.getCateList();
        this.addCateDialogVisible = false;
      });
    },
    // 添加分类 重置表单
    addCateDialogClosed() {
      this.$refs.addCateFormRef.resetFields();
      this.selectedKeys = [];
      this.addCateForm.cat_level = 0;
      this.addCateForm.cat_pid = 0;
    },
    // 删除分类
    async removeCate(id) {
      const confirmResult = await this.$confirm(
        "此操作将永久删除该分类, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning"
        }
      ).catch(err => err);
      if (confirmResult !== "confirm") {
        return this.$message.info("已取消删除！");
      }
      const { data: res } = await this.$http.delete("categories/" + id);
      if (res.meta.status !== 200) {
        return this.$message.error("删除商品分类失败！");
      }
      this.$message.success("删除商品分类成功！");
      this.getCateList();
    },
    // 显示编辑对话框
    async showEditCateDialog(id) {
      const { data: res } = await this.$http.get("categories/" + id);
      if (res.meta.status !== 200) return this.$message.error("获取分类失败！");
      this.editCateForm = res.data;
      this.editCateDialogVisible = true;
    },
    // 编辑分类名
    eidtCate() {
      this.$refs.editCateFormRef.validate(async valid => {
        if (!valid) return;
        const { data: res } = await this.$http.put(
          "categories/" + this.editCateForm.cat_id,
          {
            cat_name: this.editCateForm.cat_name
          }
        );
        if (res.meta.status !== 200)
          return this.$message.error("更新分类名失败！");
        this.$message.success("更新分类名成功！");
        this.getCateList();
        this.editCateDialogVisible = false;
      });
    }
  }
};
</script>

<style lang='less' scoped>
.treeTable {
  margin-top: 20px;
}
// .el-cascader {
//   width: 100%;
// }
</style>